I got this truck (supposed) to be (quick fix) and drive, ha ha ha, so after we completely rebuilt front end, all u joints, steering column, dash cluster parts, dash pad, rear wheel cylinders, still needs the right radiator, tires, and seat, now the battery was running down wondered why on heater selector you turn the fan on with key off the fan runs, unplug fan and all those components on a/c box under the hood and the battery will stay charged, does anyone know what I need to change so I can leave it plugged in so I can run heat. (My wife nick named it POS), thanks for any help and info.